Function poctave

Hi,

Is there any function similar to octave (
https://www.mathworks.com/help/signal/ref/poctave.html)?

I have a signal (Pink Noise) and I'm using pwelch to plot the spectrum,
which is showing me a graph with 3dB/octave attenuation, while I would like
to see a flat line (same amount of energy per octave).

Actually I'm using:
semilogx(10*log10(pwelch(pink_noise,hanning(4096),[],sampling_rate,'db')));

Kind regards,
Renato


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